Journal ArticleDOI
Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals
Li-Dong Zhao,Shih Han Lo,Yongsheng Zhang,Hui Sun,Gangjian Tan,Ctirad Uher,Chris Wolverton,Vinayak P. Dravid,Mercouri G. Kanatzidis +8 more
TLDR
An unprecedented ZT of 2.6 ± 0.3 at 923 K is reported in SnSe single crystals measured along the b axis of the room-temperature orthorhombic unit cell, which highlights alternative strategies to nanostructuring for achieving high thermoelectric performance.Abstract:
The thermoelectric effect enables direct and reversible conversion between thermal and electrical energy, and provides a viable route for power generation from waste heat The efficiency of thermoelectric materials is dictated by the dimensionless figure of merit, ZT (where Z is the figure of merit and T is absolute temperature), which governs the Carnot efficiency for heat conversion Enhancements above the generally high threshold value of 25 have important implications for commercial deployment, especially for compounds free of Pb and Te Here we report an unprecedented ZT of 26 ± 03 at 923 K, realized in SnSe single crystals measured along the b axis of the room-temperature orthorhombic unit cell This material also shows a high ZT of 23 ± 03 along the c axis but a significantly reduced ZT of 08 ± 02 along the a axis We attribute the remarkably high ZT along the b axis to the intrinsically ultralow lattice thermal conductivity in SnSe The layered structure of SnSe derives from a distorted rock-salt structure, and features anomalously high Gruneisen parameters, which reflect the anharmonic and anisotropic bonding We attribute the exceptionally low lattice thermal conductivity (023 ± 003 W m(-1) K(-1) at 973 K) in SnSe to the anharmonicity These findings highlight alternative strategies to nanostructuring for achieving high thermoelectric performanceread more
Citations
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Journal ArticleDOI
Stabilizing n‐Type Cubic GeSe by Entropy‐Driven Alloying of AgBiSe2: Ultralow Thermal Conductivity and Promising Thermoelectric Performance
TL;DR: The realization of n-type Ge chalcogenides is elusive owing to intrinsic Ge vacancies that make them p-type semiconductors, but the interplay of positive and negative chemical pressure anomalously changes the band gap of GeSe with increasing the AgBiSe2 concentration.
Journal ArticleDOI
Origin of Ultralow Thermal Conductivity in n-Type Cubic Bulk AgBiS2: Soft Ag Vibrations and Local Structural Distortion Induced by the Bi 6s2 Lone Pair
Ekashmi Rathore,Rinkle Juneja,Sean P. Culver,Nicolò Minafra,Abhishek K. Singh,Wolfgang G. Zeier,Kanishka Biswas +6 more
TL;DR: In this article, a n-type bulk cubic AgBiS2 exhibits ultralow thermal conductivity, which is essential for thermal barrier coating and thermoelectric energy conversion.
Journal ArticleDOI
Enhancing Thermoelectric Performances of Bismuth Antimony Telluride via Synergistic Combination of Multiscale Structuring and Band Alignment by FeTe2 Incorporation.
Weon Ho Shin,Jong Wook Roh,Byungki Ryu,Hye Jung Chang,Hyun-Sik Kim,Soonil Lee,Won Seon Seo,Kyunghan Ahn +7 more
TL;DR: This work demonstrates not only the effectiveness of multiscale structuring for lowering lattice thermal conductivities, but also the importance of interfacial band alignment between matrix and inclusions for maintaining high carrier mobilities when designing high-performance thermoelectric materials.
Journal ArticleDOI
Enhanced thermoelectric performance of SnTe: High efficient cation - anion Co-doping, hierarchical microstructure and electro-acoustic decoupling
Zhiwei Zhou,Junyou Yang,Qinghui Jiang,Xuesong Lin,Jiwu Xin,Abdul Basit,Jingdi Hou,Bingyang Sun +7 more
TL;DR: In this article, the effect of co-doping in both the anion and cation sites of SnTe has been investigated by adding BiCl3 and the effect on thermoelectric performance has been studied detailedly.
Journal ArticleDOI
Ultralow Thermal Conductivity in Chain Like TlSe due to Inherent Tl+ Rattling.
Moinak Dutta,Shidaling Matteppanavar,Matukumilli V. D. Prasad,Juhi Pandey,Avinash Warankar,Pankaj Mandal,Ajay Soni,Umesh V. Waghmare,Kanishka Biswas +8 more
TL;DR: Density functional theoretical (DFT) analysis reveals the bonding hierarchy in TlSe which involves ionic interaction between Tl+-Se while Tl3-Se bonds are covalent, which causes significant lattice anharmonicity and intrinsic rattler like low energy vibrations of Tl+, resulting in ultralow κL.
References
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Journal ArticleDOI
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Kanishka Biswas,Jiaqing He,Ivan Blum,Ivan Blum,Chun I. Wu,Timothy P. Hogan,Timothy P. Hogan,David N. Seidman,Vinayak P. Dravid,Mercouri G. Kanatzidis,Mercouri G. Kanatzidis +10 more
TL;DR: It is shown that heat-carrying phonons with long mean free paths can be scattered by controlling and fine-tuning the mesoscale architecture of nanostructured thermoelectric materials, and an increase in ZT beyond the threshold of 2 highlights the role of, and need for, multiscale hierarchical architecture in controlling phonon scattering in bulk thermoeLECTrics.